init(context:destroy_context:start:provide_value:inputs_available:)

init(context: UnsafeMutableRawPointer!, destroy_context: ((UnsafeMutableRawPointer?) -> Void)!, start: ((UnsafeMutableRawPointer?, UnsafeMutableRawPointer?, llb_task_interface_t) -> Void)!, provide_value: ((UnsafeMutableRawPointer?, UnsafeMutableRawPointer?, llb_task_interface_t, UInt, UnsafePointer<llb_data_t>?) -> Void)!, inputs_available: ((UnsafeMutableRawPointer?, UnsafeMutableRawPointer?, llb_task_interface_t) -> Void)!)